<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_View
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Stream.php 18951 2009-11-12 16:26:19Z alexander $
 */

/**
 * Stream wrapper to convert markup of mostly-PHP templates into PHP prior to
 * include().
 *
 * Based in large part on the example at
 * http://www.php.net/manual/en/function.stream-wrapper-register.php
 *
 * As well as the example provided at:
 *     http://mikenaberezny.com/2006/02/19/symphony-templates-ruby-erb/
 * written by
 *     Mike Naberezny (@link http://mikenaberezny.com)
 *     Paul M. Jones  (@link http://paul-m-jones.com)
 *
 * @category   Zend
 * @package    Zend_View
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_View_Stream
{
	/**
	 * Current stream position.
	 *
	 * @var int
	 */
	protected $_pos = 0;

	/**
	 * Data for streaming.
	 *
	 * @var string
	 */
	protected $_data;

	/**
	 * Stream stats.
	 *
	 * @var array
	 */
	protected $_stat;

	/**
	 * Opens the script file and converts markup.
	 */
	public function stream_open($path, $mode, $options, &$opened_path)
	{
		// get the view script source
		$path        = str_replace('zend.view://', '', $path);
		$this->_data = file_get_contents($path);

		/**
		 * If reading the file failed, update our local stat store
		 * to reflect the real stat of the file, then return on failure
		 */
		if ($this->_data === false) {
			$this->_stat = stat($path);
			return false;
		}

		/**
		 * Convert <?= ?> to long-form <?php echo ?> and <? ?> to <?php ?>
		 *
		 */
		$this->_data = preg_replace('/\<\?\=/',          "<?php echo ",  $this->_data);
		$this->_data = preg_replace('/<\?(?!xml|php)/s', '<?php ',       $this->_data);

		/**
		 * file_get_contents() won't update PHP's stat cache, so we grab a stat
		 * of the file to prevent additional reads should the script be
		 * requested again, which will make include() happy.
		 */
		$this->_stat = stat($path);

		return true;
	}

	/**
	 * Included so that __FILE__ returns the appropriate info
	 *
	 * @return array
	 */
	public function url_stat()
	{
		return $this->_stat;
	}

	/**
	 * Reads from the stream.
	 */
	public function stream_read($count)
	{
		$ret = substr($this->_data, $this->_pos, $count);
		$this->_pos += strlen($ret);
		return $ret;
	}


	/**
	 * Tells the current position in the stream.
	 */
	public function stream_tell()
	{
		return $this->_pos;
	}


	/**
	 * Tells if we are at the end of the stream.
	 */
	public function stream_eof()
	{
		return $this->_pos >= strlen($this->_data);
	}


	/**
	 * Stream statistics.
	 */
	public function stream_stat()
	{
		return $this->_stat;
	}


	/**
	 * Seek to a specific point in the stream.
	 */
	public function stream_seek($offset, $whence)
	{
		switch ($whence) {
			case SEEK_SET:
				if ($offset < strlen($this->_data) && $offset >= 0) {
					$this->_pos = $offset;
					return true;
				} else {
					return false;
				}
				break;

			case SEEK_CUR:
				if ($offset >= 0) {
					$this->_pos += $offset;
					return true;
				} else {
					return false;
				}
				break;

			case SEEK_END:
				if (strlen($this->_data) + $offset >= 0) {
					$this->_pos = strlen($this->_data) + $offset;
					return true;
				} else {
					return false;
				}
				break;

			default:
				return false;
		}
	}
}
